ML20216B041
| ML20216B041 | |
| Person / Time | |
|---|---|
| Issue date: | 08/18/1983 |
| From: | Steven Baggett, Jonathan Brown NRC |
| To: | |
| Shared Package | |
| ML20216B022 | List: |
| References | |
| SSD, NUDOCS 9805150014 | |
| Download: ML20216B041 (7) | |
Text
{{#Wiki_filter:D-O REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (Amended in its Entirety) AUG 181983 NO: NR-169-D-159-S DATE: PAGE 1 0F 5 DEVICE TYPE: Scanner Flask MODEL: 4493-97 MANUFACTURER / DISTRIBUTOR: Atomic Energy of Canada Limited P.O. Box /C.P. 3504 Ottawa, Ont. klY 4G1 MANUFACTURER / DISTRIBUTOR: 1 SEALED SOURCE MODEL DESIGNATION: Amersham Corporation Model No. CDC.PE3 ISOTOPE: Cesium-137 MAXIMUM ACTIVITY: 20 curies Depleted Uranium shielding 45.55 kilograms LEAK TEST FREQUENCY: 6 months P g CIPAL USE: (D) Gamma Gauge CUSTOM DEVICE: X YES _ NO CUSTOM USER: Atomic Energy of Canada Limited Process Analysis Services P.O. Box /C.P.1350'0 Kanata Canada 'K2KlX8 9005150014 930629 PDR RC ?,'?w,, M ruu
(3 f3 LJ O REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (Amended in its Entirety) AUG 181983 NO: NR-169-D-159-S DATE: PAGE 2 0F5 DEVICE TYPE: Scanner Flask DESCRIPTION: The device is constructed of a depleted uranium sphere ~ 6.25 inches in diameter, weighing approximately 45.5 kilograms and encased in a stainless steel cylinder. The cylinder has a thickness of 0.28 inches. The source is held in the device by a removal plug of depleted uranium encapsulated in stainless steel. The plug can be rotated to move the source from the " safe" or " transportation" position to the "open or window" position. Once positioned, the plug is held in that position by a stainless steel bolt. A tappered window, located on the side of the device, allows for insertion of a depleted uranium plug to provide additional shielding during transportation. The depleted uranium plug is replaced with a collimator plug at the time of use. The removal and insertion of the plugs is accomplished by the use of a special tool. This tool limits the radiation exposure to the users hands. Steel guide cables are used to hold a scintillation detector on one side of the column or tower to be scanned and the scanner flask on the side directly oppcsite the detector. Both the detector and flask are moved up and down the guide cables by a cable connected to synchronized hoist motors. Thus, both units move up and down the column or tower at the same time and location. The scanner flask is the source holder assembly for the AECL Gamma Scanning System. LABELING: The device is labeled in accordance with Section 20.203, 10 CFR Part 20. DIAGRAM: is a diagram of a typical site installation. Attachment 2 is a diagram of the source housing. CONDITIONS OF NORMAL USE: The device is used to scan chemical or petroleum columns or towers where gases and liquids coms in contact. The device is used in ambient environmental conditions and in temperature ranges of -40*C to 50'C. The device has been used to scan towers 300 feet above ground level. PROTOTYPE TESTING: The Amersham Corporation sealed source Model No. CDC.PE3 has been tested in accordance with ANSI N542 requirements. The source achieved a classification of 77E63535,
~1 O O REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (Amended in'its Entirety) NO: NR-169-D-159-S DATE: AUG 181983 PAGE 3 Of. 5 DEVICE TYPE: Scanner Flask PROTOTYPE TESTING (Cont'd): Since this is a custom device, the manufacturer did not test the unit. However, through engineering analysis, they estimated the ANSI N538 classification of the device.to be 24-885-885-23. Additionally, the manufacturer stated that the device had been used in Canada for three years without any report of loss of containment integrity. During the three years operational period, one incident was reported. The cable used to raise and lower the scanner flask broke. The safety cable lock assembly stopped the fall of the scanner flask within one foot of the break. This incident did not result any* release of radioactive material nor did the device loss containment integrity. EXTERNAL RADI ATION LEVELS: The manufacturer reported the following maximum dose rates for the device containing 20 curies of Cesium-137: Source in " safe" position with plug in beam path Distance 5 cm 15 millirem per hour 30 cm 7 millirem per hour 100 cm 1 millfrem per hour Source in the "open" position with collimator plug in beam path Distance 5 cm 7 millirem per hour 30 cm 2 millirem per hour 100 cm .5 millirem per hour Dose rates in beam path Distance 5 cm 270 rem per hour 30 cm 60 rem per hour 100 cm 7 rem per hour QUALITY ASSURANCE AND CONTROL: Since this is a custom device, the unit was constructed under the supervision of a mechanical engineer and in accordance with manufacturers specifications.
O O REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (Amended in its Entirety) N_0 : NR-169-D-159-S DATE: AUG1g;gg3 PAGE 4 E 5 0 DEVICE TYPE: Scanner Flask SAFETY ANALYSIS
SUMMARY
The Model 4493-97 scanner flask is a custom device and manufactured by Atomic Energy of Canada Limited for use by their personnel to provide a service to American chemical and petroleum industries. The sealed source used in the device is manufactured by Amersham Corporation and is their Model No. CDC.PE3. This source has been in use for several years without any reports of loss of containment integrity. The manufacturer claims that the device has been used in Canada for three years without any report of loss of containment integri ty. Additionally, the device is to be used by AECL personnel who are trained in the use of the equipment and in radiation safety. The increase in sealed source activity from 2 curies to the present 20 curies required the slight modification of the source holder. This modification did not affect the overall integrity of the scanner flask. Based on the above considerations and our review of the information and test data contained in the reference :ited below, we continue to conclude that the Model 4493-97 scanner flask is acceptable for custom licensing to Atomic Energy of Canada Limited. LIMITATIONS AND/0R OTHER CONSIDERATIONS OF USE: This device shall be distributed and used only by the specific licensee of the NRC, o Atomic Energy of Canada Limited, The device shall be leak tested at six month intervals using techniques capable o of detecting 0.005 microcuries of removable contamination, o Handling, storage, use, transfer, and disposal: To be determined by the licensing authority. In view that the sealed source exhibits high surface dose rates when unshielded, these sealed sources should be handled only by experienced licensed personnel using adequate remote handling equipment and procedures. o :This registration sheet and the information contained within the references shall not be changed or transferred without the written consent of the NRC. h eN0 skoO brh$ 1 enorcerestric[a 0asa50guak$8sbk'mh$ access areas aroun0 khe sc!$re1"b*inkpment.tNe*ank te
REFERENCES:
anning equ The following supporting documents for the AECL Model 4493-97 device are hereby incorporated by reference and are made a part of this registry document: Atomic Energy of Canada Limited, Process Analysis Services application hand o delivered April 21, 1983 and letters dated May 10, 1983 and July 29, 1983.
O O REGISTRY OF RADI0 ACTIVE SEALED SOURCES AND DEVICES SAFETY EVALUATION OF DEVICE (Amended in its Entirety) NO: NR-169-0-159-S DATE: PAGE 5 0F 5 Agg 7 g ;gg l j DEVICE TYPE: Scanner Flask ISSUING AGENCY: l U.S. Nuclear Regulatory Commission .q Date: Reviewer: ~ M Date: AUG 1 9 1983 Concurrence: [ w a /l[. dt-w y' / l
M: NR-169-D-159-S DATE: OG 181983 - PULLEYS E / I SOURCE DETECTOR DRIVE DRIVE c 1 l _t I i DETECTOR CABLE REEL ~ 1. l /* I / ] 'l e S0VRCE[_N- -{-- -hj.- DETEbTOR <s., N .s ELECTRICAL CABLE REELS l I <<<'</Je CONTROL '<'<<(.<<j<<< CONSOLE O _"N ~~_ TYPICAL ARRANGEMENT OF GAMMA SCANNING EQUIPMENT .i 2.'.
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